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CN100530706C - Drive device for back light unit and drive method therefor - Google Patents

Drive device for back light unit and drive method therefor Download PDF

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CN100530706C
CN100530706C CN 200580000861 CN200580000861A CN100530706C CN 100530706 C CN100530706 C CN 100530706C CN 200580000861 CN200580000861 CN 200580000861 CN 200580000861 A CN200580000861 A CN 200580000861A CN 100530706 C CN100530706 C CN 100530706C
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drive
device
method
back
light
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CN 200580000861
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CN1842923A (en )
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古川德昌
市川弘明
菊地贤一
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索尼株式会社
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Abstract

本发明针对用于背光单元(20)的驱动装置,背光单元中多个LED(发光二极管)元件以每三原色的方式串联连接,驱动装置包括:PWM控制电路(44),用于生成具有PWM信号,该PWM信号用于控制用于驱动LED元件组的FET的导通/关断;FET(43),用于基于已由PWM控制电路(44)生成的PWM信号,在导通期间驱动LED元件组(30)发光;电压供应单元(41),用于向每个LED元件组(30)供应预定电压;发光量检测单元(33),用于检测已从LED元件组(30)发射的光线的量;热值检测单元(32),用于检测根据已被供应到电压供应单元(41)的电压而从LED元件组发出的热值;以及控制单元(50),用于基于已由发光量检测单元(33)检测到的发光量和已由热值检测单元(32)检测到的热值,控制PWM控制电路(44)。 The present invention is directed to a backlight unit driving apparatus (20), the backlight unit, a plurality of LED (Light Emitting Diode) of three primary colors of each element are connected in series, the driving device comprising: PWM control circuit (44) for generating a PWM signal having the PWM signal for controlling the FET for driving the LED element group is turned on / off; FET (43), based on the PWM signal by the PWM control circuit (44) generates, drives the LED element is turned on during the light emission amount detecting means (33) for detecting from the LED elements (30) transmitted; group (30) to emit light; voltage supply unit (41), (30) for supplying a predetermined voltage to each LED element group amount; heat value detecting means (32) for detecting the value of heat emitted from the LED element has been set according to a voltage supplied to the voltage supply unit (41); and a control unit (50), based on light emission by the calorific value amount detecting means (33) detected by the heat emission amount and the value detection unit (32) detects and controls the PWM control circuit (44).

Description

用于驱动背光单元的装置和方法 Device and method for driving a backlight unit

技术领域 FIELD

本发明涉及适合执行由多组LED元件组成的背光单元的驱动控制的驱动装置和驱动方法。 The present invention relates to a driving apparatus and a driving method of controlling the backlight unit adapted to perform a plurality of sets of LED elements.

本申请要求2004年7月12曰递交的日本专利申i青No. 2004-205146和2004年11月19日递交的日本专利申请No. 2004-336373的优先权,这里通过引用结合了这些专利申请的全部内容。 This application claims filed July 12, saying the Japanese Patent Application No. 2004-205146 i Green and Japanese Patent November 19, 2004 filed Application No. 2004-336373, and hereby incorporated by reference these patent applications the entire contents.

背景技术 Background technique

在使用LED (发光二极管)元件作为显示像素的显示设备中,为了执行LED元件的矩阵驱动操作,需要用于各个像素的XY寻址驱动电路。 In a display apparatus using LED (light emitting diode) device as a display pixel, in order to perform matrix driving operation of the LED element, a need for XY addressing each pixel driving circuit. 显示设备用于利用寻址驱动电路来执行对位于希望被发射(点亮)的像素的位置处的LED元件的选择(寻址),.以利用例如PWM (脉宽调制)驱动系统来调制点亮时间,从而执行辉度(luminance)调整,以获得具有预定灰度(gradation)的显示图片。 A display device for performing selection of the desired transmitted located (lighting) pixels LED element at a position (address) to use the address driving circuit using, for example ,. PWM (Pulse Width Modulation) modulation point drive system bright-up time, thereby performing luminance (luminance) adjusted to obtain a display image having a predetermined gradation (gradation) of.

但是,当驱动电路是针对单独的LED来装配时,在LED数目巨大的情况下,电路配置变得复杂,因此成本提高。 However, when the driving circuit is assembled for an individual LED, the huge number of LED, the circuit configuration becomes complicated, thus raising the cost.

另一方面,已提出并研究使用LED元件作为液晶显示器的背光光源。 On the other hand, it has been proposed and studied using an LED element as a backlight source of a liquid crystal display. 具体而言,由于如下方法可以容易地实现颜色平衡:分别为红(R)、绿(G)和蓝(B)原色的LED元件被单独地用于在光学上执行合成加法混色以获得白光,因此这样的方法被广泛地研究作为电视图像接收机的显示设备。 Specifically, since a method of color balance can be easily achieved: red, respectively (R), green (G) and blue (B) primary color LED elements are individually used to perform the synthesis of optically additive mixture to obtain a white light, such methods are therefore widely studied as a display device of the television receiver.

同时,LED单独地具有辉度值的不均匀性。 Meanwhile, LED individually have unevenness in brightness value. 当试图校正这些单独的不均匀性时,必须利用独立的驱动电路来逐个驱动各个单独的元件。 When attempting to correct unevenness of the individual must use a separate driving circuit driven by one individual element. 这样一来,驱动形式变得极类似于与先前描述的使用LED元件作为显示像素的显示设备相对应的矩阵型驱动系统的形式。 Thus, the driving becomes very similar to the form of the previously described using an LED element as a pixel of a display form of the display device corresponding to the matrix type drive system. 即,在LED元件数目巨大的情况下,采用寻址的驱动电路将变得很复杂。 That is, in the case where a great number of LED elements, using the address driving circuit will become complicated.

此外,在诸如LED元件之类的元件被用作液晶显示设备的背光光源的 Further, in the element such as an LED element or the like is used as the liquid crystal display device of a backlight light source

情况下,由于分别为红(R)、绿(G)和蓝(B)原色的LED元件的发光系数彼此不同,因此还必须针对每个颜色,调整将被提供到各颜色的LED元件的电流。 Current case, since each of the red (R), green (G) and blue (B) LED element emitting the primary colors coefficients different from each other, it must also be provided to each color for each color, the adjusted LED element . 此外,在LED元件中,由于各个颜色元件的半导体组成彼此不同,所以各个颜色元件的电压和功耗彼此不同。 Further, in the LED elements, the semiconductor elements constituting the respective colors different from each other, the voltage and power elements of the respective colors different from each other.

另外,在具有大功率的各LED元件并出于照明目的被用于LED驱动操作的实际电路中,由于还未准备针对大功率驱动的LSI等,因此矩阵型驱动系统的成本提高,从而在经济上存在缺点。 Further, in the element having a high power LED for illumination purposes and is used for the actual operation of the LED driving circuit, since the power is not ready for the driving LSI or the like, thus raising the cost matrix drive system, whereby the economy shortcomings on.

鉴于此,提出了如下方法:LED元件的连接形式使用为级联连接的形式,以便不会使得电路规模太大。 In view of this, a method is proposed: the use of LED elements connected in the form of cascading connection so that the circuit will not be too big. 在级联连接形式中,基于从红色、绿色和蓝色的LED元件发出的光线的合成,对在某一系列LED连接组(例如各个颜色的红、绿和蓝色LED元件连接而成的组)中的电流执行PWM调 In the form of cascade connection, based on the synthesized light emitted from the red, green and blue LED elements, a group of series connected LED group (e.g., respective colors of red, green and blue LED elements connected to each ) current in the PWM modulation

整,以调整色调和辉度。 Whole, to adjust the hue and brightness.

在采用级联连接形式作为LED元件的连接形式的背光单元中,提供了用于向级联连接的每组红色、绿色和蓝色LED元件输送预定电压的DC-DC 变换器电源单元, 并且在负载侧提供了LED-PWM控制单元。 In the backlight unit are connected in cascade form as a connection element in the form of LED, a DC-DC converter connected to a power supply unit for each of the red cascade, green and blue LED elements conveyed by a predetermined voltage, and providing the load-side LED-PWM control unit.

同时,在上述配置中,由于各颜色系统的发光输出的温度相关性也不同,并且温度特性不一致,因此需要利用各颜色专用的驱动电路对每种颜色的脉宽执行调整。 Meanwhile, in the above configuration, since the temperature of the light emission output of each color system different correlations, and inconsistent temperature characteristics, it is necessary for each color using a dedicated drive circuit performs the pulse width adjustment for each color.

例如,在背光刚刚点亮之后温度没有完全上升的情况下,具有高发光效率的红色的LED元件在PWM信号的驱动脉宽的ON时间的大约50%的时间中发光,而具有低发光效率的LED元件在PWM信号的驱动脉宽的ON时间的大约80〜90%的时间中发光。 For example, in the case where immediately after the lighting of the backlight is not completely risen temperature, a red with high luminous efficiency of LED elements emitting at about 50% of the pulse width of the PWM signal driving ON time of the time, while having a low emission efficiency LED elements emitting at about 80~90% of the time the driving pulse width of the PWM signal of oN time.

由于从LED元件发出的光线具有这样的属性,因此必须确保通过合成从红色、绿色和蓝色LED元件发射的光线而获得的白光的色调(色温和色度)和辉度保持不变,从而利用光传感器检测分别从红色、绿色和蓝色LED元件发射的光线以执行反馈伺服,以使这样检测出的值变为恒定。 With such a property from the light emitted by the LED element, and therefore must be obtained to ensure that the light from the red, green and blue LED elements emitted by synthesizing tone of white light (color temperature and color) and luminance remains unchanged, so that the use of detecting light from the optical sensor, respectively, red, green and blue LED elements emitted to perform the servo feedback, such that the value detected becomes constant. 在这样的反馈系统中,例如在用于控制PWM信号的脉宽的改变的分辨率粗糙的情况下,将导致调整准确度的差异,使得依赖于0%到100%之 Coarse resolution in the case of such a feedback system, for example for controlling the pulse width of the PWM signal change will lead to differences in adjustment accuracy, so that dependent on the 0% to 100% of the

间的分割数目,改变宽度在具有良好(高)发光效率的红色LED元件的情况下变粗糙,而改变宽度在具有差(低)发光效率的蓝色LED元件的情况下变精细。 Between the number of divisions, in the case of changing the width of a good (high) efficiency of light emission red LED elements becomes rough, and the width of change in the case of a difference between the (low) light emission efficiency blue LED element becomes fine.

此外,由于从LED元件发射的光线的颜色由于各颜色系统的分辨率的差异而针对各个颜色具有不均匀的准确度,因此对RGB平衡的调整和/或对白光的调整变得困难。 Further, since the color of the light emitted from the LED elements due to the difference of the respective colors the resolution of the system is accurate for each color unevenness, and therefore it is difficult to adjust the RGB balance and / or adjustment of the white light.

另外,即使上述问题都可被解决,各颜色的LED元件的发光输出和发光光谱分布都随各颜色的LED元件中的温度改变而改变,从而使各个颜色的发光色度改变。 Further, even if the above problems can be solved, and the emission output of the emission spectrum distribution of each color LED elements of the respective colors change with the temperature of the LED element is changed, thereby changing the light emission chromaticity of each color. 因此,在只采用利用光传感器来检测各颜色的LED元件的光量的方法的情况下,无法校正色调的改变。 Thus, in the case where only the method using a light sensor to detect the amount of light of each color of the LED elements can not change the color tone of the correction. 在背光单元具有温度分布(例如在其驱动操作时的向上和向下方向上)的情况下,将发生基于这种温度差异的颜色不均匀性。 The case where the unit has a temperature distribution (e.g. upward and downward direction when the driving operation) of the backlight, color unevenness will occur on such temperature difference. 如上所述,光传感器的性能和/或LFX)元件的发光分布的温度特性是对维持准确度的一个限制,使得色度控制偏差大约是At« 0.002禾卩Ay « 0.002 。 As described above, the temperature distribution characteristics of the light emitting performance of the light sensor and / or LFX) is a restriction element to maintain accuracy, so that the control deviation is approximately chromaticity At «0.002 Wo Jie Ay« 0.002.

发明内容 SUMMARY

本发明要解决的问题: The present invention is to solve the problem:

本发明是鉴于上述现有技术具有的问题而提出的,其目的在于提供用于背光单元的驱动设备和驱动方法,该驱动设备和驱动方法适合于基于构成背光单元的LED元件组的一个或多个热值和发光量,控制用于使LED 元件组发光的驱动单元。 The present invention is made in view of the prior art having the above-described problems and has as its object to provide a driving apparatus and a driving method for a backlight unit, the driving device and the driving method is adapted to constitute a backlight unit or an LED element group based a light emission amount and the calorific value, controlling a group of light emitting elements of the LED driving unit.

根据本发明的驱动设备针对一种用于包括LED (发光二极管)元件组的背光单元的驱动设备,在所述LED元件组中,每个LED元件组由具有相同颜色的LED元件串联连接而成,所述驱动设备包括:PWM控制电路,用于生成PWM信号,该PWM信号用于控制用于调整所述发光二极管元件组的发光量的FET的导通/关断;所述FET,用于基于已由所述PWM控制电路生成的PWM信号,在导通期间驱动所述发光二极管元件组发光;电压供应装置,用于向所述发光二极管元件组供应电压;发光量检测装置,用于检测从已被供应了电压的发光二极管元件组发射的光线的量;温度检测装置,用于检测所述发光二极管元件组的一个或多个温度; 以及CPU,用于基于已由所述发光量检测装置检测到的发光量和已由所述温度检测装置检测到的一个或多个温度,至少控制所述PWM控制电路, 以生成适当 Drive apparatus according to the present invention is directed to an apparatus for driving a backlight unit comprising an LED (light emitting diode) element group, in the LED element group, each group consisting of LED elements having the same color LED elements connected in series the drive apparatus comprises: PWM control circuit for generating a PWM signal, the PWM signal for controlling the FET for adjusting an amount of light emission of the light emitting diode element group is turned on / off; the FET, for based on the PWM control by the PWM signal generating circuit, during the on-driving the light emitting diode light emitting element group; a voltage supply means for supplying a voltage to said light emitting diode element group; luminescence amount detecting means for detecting the amount of light emitted from the light emitting diode element has been supplied with a voltage group; a temperature detecting means for detecting a group of said light emitting diode elements or a plurality of temperature; and the CPU, for detecting the amount of light emission has been based on one or more of the detected temperature of the device detected by the luminescence amount and the temperature detecting means, controlling at least the PWM control circuit to generate the appropriate 所述PWM信号。 The PWM signal.

此外,根据本发明的驱动方法是一种用于包括LED (发光二极管)元件组的背光单元的驱动方法,在所述LED元件组中,每个LED元件组由具有相同颜色的LED元件串联连接而成,所述驱动方法包括:电压供应步骤,该步骤将电压供应到每个所述发光二极管元件组;发光量检测步骤, 该步骤检测从已被所述电压供应步骤供应了电压的发光二极管元件组发射的光线的量;温度检测步骤,该步骤检测所述发光二极管元件组的一个或多个温度;信号生成步骤,该步骤基于已由所述发光量检测步骤检测出的发光量和已由所述温度检测步骤检测出的一个或多个温度,生成PWM信号,该PWM信号用于控制所述发光二极管元件组的发光量;以及控制步骤,该步骤基于已由所述信号生成步骤生成的所述PWM信号,控制所述多个发光二极管元件组的发光量。 Further, according to the driving method of the present invention is a method of driving a backlight unit comprising a LED (Light Emitting Diode) element group is used, the LED element groups, each group of LED elements connected in series from the LED elements having the same color from, the driving method comprising: a voltage supply step of supplying a voltage to each of the light emitting diode element group; luminescence amount detecting step of detecting from the light emitting diode has been supplied to the voltage supply voltage step the amount of light emitting element group; a temperature detecting step, one or more of the step of detecting the temperature of the light emitting diode element group; signal generating step, the amount of light emission and the step has been detected based on the luminescence amount detecting step one or more temperature detected by said temperature detecting step, generating a PWM signal, the PWM signal for controlling the amount of light emission of the light emitting diode element group; and a control step of generating said signal generating step has been based on the PWM signal to control the amount of light emitting diodes of the plurality of light emitting element group.

在根据本发明的驱动设备和驱动方法中,在驱动被用作液晶背光的LED元件的系统中,与任意颜色相关的光传感器的检测结果被使得作为监控其他颜色的参考,以执行相关百分比(比率)的反馈,并且基于温度传感器的检测结果,改变经历反馈的比率,从而使执行完全一致的控制成为可能。 In the driving apparatus and a driving method of the present invention, the driving of the liquid crystal element is used as LED backlight system, associated with a detection result of an arbitrary color such as light sensor is monitoring other color reference to execute the relevant percentage ( ratio) feedback, and based on the detection result of the temperature sensor, changing the ratio undergoes feedback control so that exactly the same execution becomes possible.

从下面将参考附图描述的实施例中,本发明的其他目的和通过本发明获得的优点将变得更加清楚。 From the embodiments described with reference to the following drawings, other objects and advantages of the present invention are obtained by the present invention will become more apparent.

附图说明 BRIEF DESCRIPTION

图1是以模型形式示出本发明应用到的背光系统的彩色液晶显示装置的立体图。 FIG. 1 is a color liquid crystal model shown in the form of the present invention is applied to a backlight system displays a perspective view of the device.

图2是示出彩色液晶显示装置的驱动电路的框图。 FIG 2 is a block diagram illustrating a driving circuit of the color liquid crystal display device.

图3是示出构成彩色液晶显示装置的背光单元中所使用的发光二极管 3 is a diagram illustrating a light emitting diode forming a color LCD backlight unit is used in the display

9的布置示例的平面图。 9 is a plan view of an example arrangement.

图4是利用电路图符号的二极管标记以模型形式示出发光二极管的布置示例中的各个发光二极管的连接形式的图。 FIG 4 is a circuit diagram illustrating the use of a diode symbol marked departure in form of the model shown in the form of connection of each light emitting diode LED arrangement example in FIG.

图5是利用按照各颜色的发光二极管序号的图案符号,以模型形式示 FIG 5 is a light emitting diode using the pattern of the symbol number of each color, the model shown in the form of

出单元体(imitcell)的图,在该单元体中总共六个发光二极管排列成行。 FIG out unit body (imitcell), in which a total of six unit body light emitting diodes arranged in rows. 图6是利用按照发光二极管序号的图案符号,以模型形式示出充当基 FIG 6 is a light emitting diode using pictorial symbols according to the number, the form shown in the model serves as a base

本单元的三个单元体被相继连接的情况的图。 FIG present case three units are successively connected unit.

图7是以模型形式示出构成背光单元的光源的发光二极管的实际连接 7 is a model of the actual connection in the form of a light emitting diode constituting the light source of the backlight unit shown in the

示例的图。 Example of FIG.

图8是以模型形式示出在背光单元中使用的发光二极管的连接示例的图。 FIG 8 is a model diagram showing a connection example in the form of light emitting diodes used in the backlight unit.

4图9是以模型形式示出显示装置的温度分布的图。 4 is a model form in FIG. 9 shows a graph showing the temperature distribution of the device.

图10是以模型形式示出背光单元中的发光二极管的连接状态和显示装置的温度分布的图。 10 is a model diagram showing the form of the temperature distribution in the connected state of the light emitting diode backlight unit and a display apparatus.

图11是用于说明用于从一个温度传感器和温度分布模式估计各位置的温度的处理的图。 FIG 11 is a diagram showing processing for estimating the temperature of each position from one temperature sensor and a temperature distribution pattern.

图12是示出用于驱动发光二极管的驱动电路的框图。 FIG 12 is a block diagram illustrating a driving circuit for driving the light emitting diode.

图13是用于说明从各LED元件发射的光线的温度特性的图。 FIG 13 is a chart showing temperature characteristics of the emitted light from each LED element for explaining.

图14是示出相对于各LED元件的温度改变的波长改变以及由此而来的亮度(brightness)特性的特性图。 FIG 14 is a characteristic diagram showing temperature changes with respect to changing the wavelength of each LED element, and the resulting luminance (Brightness) characteristics.

图15是示出当从各LED元件发射的光线被组合以在光学上执行背光单元处的合成加法混色以获得白光时的白色色度偏差的图。 15 is a diagram showing when the light from each of the LED elements emitted from the backlight unit are combined to perform the synthesis of optically additive mixture to obtain a white white chromaticity deviation.

图16A和图16B是示出通过在光学上执行光学输出平衡而获得的数据的图。 16A and 16B are diagrams illustrating the data on the optical performing optical output obtained by the balance of FIG.

图17是示出背光单元的配置的框图。 FIG 17 is a block diagram illustrating the configuration of the backlight unit.

图18A、图18B和图18C是用于说明PWM信号的分辨率的图。 Figures 18A, 18B and 18C is the resolution of the PWM signal for explaining FIG. 图19A、图19B和图19C是示出被输送到各颜色的LED元件组的PWM信号的波形的图。 FIG. 19A, 19B and 19C are diagrams showing waveforms of the PWM signal is fed to an LED of each color element group.

图20A、图20B和图20C是示出被输送到各颜色的LED元件组的 FIG. 20A, 20B and 20C are diagrams illustrating the respective colors is conveyed to the LED element group

10PWM信号的波形的实际示例的图。 FIG 10PWM practical example of the waveform signal.

具体实施方式 detailed description

下面将参考附图详细说明本发明的实施例。 In detail below with reference to the accompanying drawings embodiments of the present invention.

本发明例如被应用到具有如图1所示配置的背光系统的彩色液晶显示 For example, the present invention is applied to a color liquid crystal backlighting system having the configuration shown in Figure 1 Show

装置100。 100 apparatus.

如图l所示的彩色液晶显示装置100包括透射(transmission)式彩色液晶显示面板10和被设置在彩色液晶显示面板10后面一侧的背光单元20。 The color liquid crystal display device shown in Figure l 100 includes a transmission (Transmission) type color liquid crystal display panel 10 and a color liquid crystal display is disposed behind the backlight unit 10 side of the panel 20.

透射式彩色液晶显示面板IO具有以下配置:TFT基板(衬底)11和反向电极基板(衬底)12彼此相对地布置,并且液晶层13被设置在两衬底之间的间隔中,在所述液晶层13中例如填充有扭曲向列型(TN)液晶。 Transmissive type color liquid crystal display panel IO has the following configuration: TFT substrate (substrate) 11 and a counter electrode substrate (substrate) 12 disposed opposite to each other, and the liquid crystal layer 13 is disposed in the space between two substrates, the for example, the liquid crystal layer 13 is filled with a twisted (TN) liquid crystal nematic. 在TFT基板11上,形成有以矩阵形式布置的信号线14和扫描线15,以及作为开关元件的薄膜晶体管16和布置在其交叉点处的像素电极17。 On the TFT substrate 11 is formed with a signal line 14 and the scanning lines 15 are arranged in a matrix form, and a thin film transistor 16 is arranged as a switching element and the pixel electrode 17 at their crossing point. 薄膜晶体管16被扫描线15顺序选择,并用于将从信号线14传递来的视频信号写入到相应的像素电极17中。 The thin film transistor 16 are sequentially selected scanning line 15, and a video signal transmitted from the signal line 14 is written into the corresponding pixel electrode 17. 另一方面,反向电极18和滤色器19被形成在反向电极基板12的内表面。 On the other hand, the color filter 18 and the counter electrode 19 is formed on the inner surface of the opposite electrode 12 of the substrate.

彩色液晶显示装置100被装配为使具有这种配置的透射式彩色液晶显示面板10被放置在两个极化板之间,以在由背光单元20从后面一侧照射白光的状态中,利用有源矩阵系统来执行驱动操作,从而可以获得所需的全彩色图像显示。 Color liquid crystal display device 100 is assembled such that the transmissive type color liquid crystal display panel having such a configuration 10 is placed between two polarizing plates, in order from the backlight unit 20 is irradiated from the back side of the white state, has the use of system to perform active matrix driving operation, thereby obtaining a desired full-color image display.

背光单元20包括光源21和波形长度选择过滤器22。 The backlight unit 20 includes a light source 21 and a wave length selection filter 22. 背光单元20用于照射从光源21发射的光线,以通过波形长度选择过滤器22从其后面一侧照明彩色液晶显示面板10。 The backlight unit 20 for irradiating the light emitted from the light source 21, to select the filter length of the waveform 22 of the display panel 10 from the rear side of the color liquid crystal lighting.

本发明应用到的彩色液晶显示装置100例如由具有图2所示电路配置的驱动电路200驱动。 The present invention is applied to a color liquid crystal display device 100, for example, a drive circuit 200 having the circuit configuration shown in FIG. 2.

驱动电路200包括:电源单元110,用于输送彩色液晶显示面板10和背光单元20的驱动电力;适合于驱动彩色液晶显示面板10的X驱动器电路120和Y驱动器电路130; RGB过程处理单元150,其通过输入端子140被提供了来自外部的视频信号;连接到RGB过程处理单元150的图像存储器160和控制单元170;以及用于执行背光单元20的驱动控制的背光驱动控制单元180。 Driving circuit 200 comprises: a power supply unit 110 for conveying color liquid crystal display driving power panel 10 and the backlight unit 20; suitable for driving the color liquid crystal display X driver 120 and Y driver circuit 130, the circuit panel 10; the RGB process processing unit 150, which is supplied through an input terminal 140 of the video signal from the outside; connected to the RGB process processing unit 160 of the image memory 150 and a control unit 170; and a backlight driver for controlling the backlight unit 20 performs a driving control unit 180.

在驱动电路200中,通过RGB过程处理单元150,已通过内部端子140输入的视频信号Vi被使得经历诸如色度处理等的信号处理。 In the driving circuit 200, an RGB process processing unit 150, that has been subjected to processing such as chrominance signal processing by the video signal Vi input terminal 140 inside. 此外,这样处理后的视频信号Vi被从复合信号转换成适合于彩色液晶显示面板10 的驱动操作的RGB分离信号。 Further, the video signal Vi thus processed is converted from the composite signal into RGB separate signals suitable for driving operation panel 10 of the color liquid crystal display. 这样获得的RGB分离信号被传递到控制单元170,并通过图像存储器160被传递到X驱动器120。 RGB separate signal thus obtained is transmitted to the control unit 170, and is transmitted to the X driver 120 through the image memory 160. 此外,控制单元170利用通过图像存储器160输送到X驱动器120的RGB分离信号,以对应于RGB分离信号的预定时序控制X驱动器电路120和Y驱动器电路130,来驱动彩色液晶显示面板10,以显示与RGB分离信号相对应的图像。 Further, the control unit 170 using 160 conveyed through the image memory to the X driver RGB separate signal 120 to correspond to a predetermined timing RGB separate signals for controlling the X driver circuit 120 and the Y driver circuit 130 drives the color liquid crystal display panel 10 to display separating the image signal corresponding to the RGB.

背光单元20是直接下照明类型,其中透射式彩色液晶显示面板10被放置在其后面,并且用于从后面的直接下方的部分照射彩色液晶。 The backlight unit 20 is under the direct illumination type in which a transmissive color liquid crystal display panel 10 is placed on its back, and a color liquid crystal portion irradiated from directly below the back. 背光单元20的光源21包括多个LED (发光二极管),并且使用这些多个发光二极管作为发光源。 The light source 21 of the backlight unit 20 includes a plurality of LED (Light Emitting Diode), and uses these plurality of light emitting diodes as a light source. 多个发光二极管被划分成包括多组发光二极管的集合, 并且每个这些集合被驱动。 A plurality of light emitting diodes are divided into a plurality of groups comprising a set of light emitting diodes, and each of these sets are driven.

然后,在背光单元20的光源21处的发光二极管的布置将被说明。 Then, the light emitting diode is arranged at the light source 21 of the backlight unit 20 will be explained.

图3示出以下状态:作为发光二极管的布置示例,在每个单元体4-1、 4-2中分别使用两个红色发光二极管1、两个绿色发光二极管2和两个蓝色发光二极管3,从而总共六个发光二极管排列成行。 Figure 3 illustrates the following states: as an example of a light emitting diode is arranged, 4-1, 4-2, respectively, using two red light emitting diode 1, two green light emitting diodes and two blue light emitting diodes 2 in each unit body 3 thus a total of six light-emitting diodes arranged in rows.

虽然在该布置示例中提供了六个发光二极管作为单元体4,但是各颜色数目的分布可能根据调整光输出平衡的需要而不同于该示例,这是因为混合的颜色根据所使用的发光二极管的等级和/或发光效率等被使得成为具有良好平衡的白光。 While providing six light emitting diodes in the exemplary arrangement as the unit body 4, the number of the respective colors may differ from the exemplary distribution of the optical output adjustment need to balance, this is since the mixing of the color light-emitting diodes used levels and / or the luminous efficiency is such that the white light has become well-balanced.

在图3所示的布置示例中,单元体4-1和单元体4-2具有完全相同的配置,并且它们的在中心的两个端部相连,如箭头所指示的。 In the exemplary arrangement shown in Figure 3, the unit body unit body 4-2 and 4-1 have identical configurations, and both ends thereof are connected at the center, as indicated by the arrow. 此外,图4 示出了利用电路图符号的二极管标记来图示单元体4-1和单元体4-2的连接形式的示例。 Further, FIG. 4 shows a circuit diagram of a diode symbol using the symbols 4-1 to illustrate an example of the unit cell and the cell body is connected in the form of 4-2. 在该示例的情况下,各发光二极管(即红色的发光二极管1、绿色的发光二极管2和蓝色的发光二极管3)在它们具有遵循电流从左到右流动方向的极性的状态下串联连接。 In the case of this example, light-emitting diodes (i.e., a red LED, a green light emitting diode and the blue light emitting diode 2 3) has left to right to follow the current state of the polarity connected in series in the flow direction thereof .

这里,当利用各颜色的发光二极管的数目来执行对单元体4 (其中分别使用了两个红色发光二极管1、两个绿色发光二极管2和两个蓝色发光二极管3,从而总共六个发光二极管排列成行)的图案注释时,它被表示为(2G2R2B),如图5所示。 Here, when using a number of light emitting diodes of the respective colors to perform unit 4 (which respectively using two red light emitting diode 1, two green and two blue light emitting diodes 2 light emitting diode 3, so that a total of six light-emitting diodes when aligned) pattern annotations, which is expressed as (2G2R2B), as shown in FIG. 即,(2G2R2B)示出:由两个绿色图案、两个红色图案和两个蓝色图案构成的总共六个图案被使得作为基本单元。 That is, (2G2R2B) shows: A total of six patterns of two patterns of green, two red and two blue patterns are configured such that the pattern as a basic unit. 此外,在如图6所示那样相继连接基本单元的三个单元体的情况下,当按照被表示为3*(2G 2R 2B)的符号利用发光二极管的数目来执行图案注释时, 这些单元体用(6G 6R 6B)来指示。 Further, in a case where three unit cells are connected successively as the basic unit of FIG. 6, when the number of symbols in accordance with the use of light emitting diode is represented as a 3 * (2G 2R 2B) to perform pattern annotation, such unit cells with (6G 6R 6B) are indicated.

然后,在背光单元20的光源21处的发光二极管的连接关系将被说明。 Then, the relationship between the light emitting diode is connected at the source 21 of the backlight unit 20 will be explained.

如图7所示,在光源21处,比先前描述的发光二极管的基本单元(2G 2R 2B)大三倍的基本单元被使得作为一个中间单元(6G 6R 6B),从而使多个中间单元(6G 6R 6B)以矩阵形式排列,该矩阵在相对于屏幕的水平方向上有五行,在垂直方向上有四列。 7, at the light source 21, the basic unit of the light emitting diode described previously (2G 2R 2B) is three times the basic unit such as an intermediate unit (6G 6R 6B), such that a plurality of intermediate units ( 6G 6R 6B) arranged in a matrix, the matrix with respect to the five rows in the horizontal direction of the screen, there are four in the vertical direction. 这样一来,总共布置了360个发光二极管。 Thus, a total of 360 light emitting diodes are arranged. 这些中间单元(6G 6R 6B)在屏幕的水平方向上电连接,使发光二极管被排列在屏幕的水平方向上。 These intermediate units (6G 6R 6B) are electrically connected in the horizontal direction of the screen, the light emitting diodes are arranged in the horizontal direction of the screen. 如上所述,在背光单元20的光源21处,在屏幕的水平方向上电连接的中间单元(6G 6R 6B)被串联连接,如图8所示。 As described above, the backlight unit 21 at the light source 20, the intermediate units (6G 6R 6B) in the horizontal direction of the screen of the electrical connection are connected in series, as shown in FIG. 这样,形成了由在水平方向上串联连接的多个发光二极管构成的多个组30。 Thus, a plurality of groups 30 composed of a plurality of light emitting diodes connected in series in the horizontal direction.

此外,在背光单元20处,对各个由在水平方向上串联连接的发光二极管构成的组30逐个分别提供独立的LED驱动电路31。 Further, at the backlight unit 20, each group consisting of light emitting diodes connected in series in the horizontal direction by one of 30 separate LED driving circuit 31, respectively. LED驱动电路31是用于允许电流在发光二极管的组30中流动以使它们发光的电路。 LED drive circuit 31 is set to allow current to flow in the light emitting diode 30 so that they emit light circuit.

这里,对于在水平方向上串联连接的发光二极管的组30的布置,存在如下状态:其中被布置在某个区域内的发光二极管彼此连接,在所述区域中,当测量背光单元20的温度分布时,各LED具有基本相同的温度。 Here, for the light emitting diode disposed in series connected in the horizontal direction of the group 30, there is a status: wherein is disposed within an area of ​​light emitting diodes connected to each other in the region, when the temperature distribution of the backlight unit 20 measuring when each LED has substantially the same temperature.

在操作背光单元20时,彩色液晶显示装置100的屏幕上的温度分布示例如图9所示。 When operation of the backlight unit 20, a color liquid crystal display device 100 on the screen temperature distribution of the example shown in Fig. 图9示出的阴影浓的部分是高温区域,而阴影淡的部分 Concentrated hatched portion in FIG. 9 shows a high-temperature region, and the light shading portion

13是低温区域。 13 is a low temperature area. 如图9所示,在彩色液晶显示装置100中,随着到图片上部Su的距离縮短而温度变高,温度变得更高,并且屏幕下部Sd具有低温。 9, the apparatus 100 in the color liquid crystal display, as the distance from the upper image Su shortening of temperature becomes high, the temperature becomes higher, and the screen lower portion Sd having a low temperature.

图10的图中,图8中指示发光二极管的连接关系的图和图9的温度分布图彼此重叠。 FIG. 10, indicated in FIG. 8 and FIG connection relationship of the light emitting diode temperature profile 9 overlap each other. 如图io所示,在该示例中,当在屏幕的水平方向上排 As shown in FIG IO, in this example, when the row in the horizontal direction of the screen

列的发光二极管被连接时,具有基本相同温度的发光二极管被彼此连接。 LED LED column when connected, having substantially the same temperature are connected to each other.

此外,在背光单元20处,如图10所示,提供了温度传感器32,用于检测各发光二极管组30的温度。 Further, at the backlight unit 20, shown in Figure 10, a temperature sensor 32 for detecting the temperature of each light emitting diode group 30.

作为温度传感器32,如图IO所示,可以在与被串联连接在水平方向上的发光二极管的组相对应的各个垂直位置上分别设置多个LED,或者可以在一个背光单元20处仅设置一个LED。 As the temperature sensor 32, as shown in FIG IO, a plurality of LED may be provided in each of the vertical position of the light emitting diode is connected in series in a horizontal direction corresponding to the group, respectively, or may be provided only one of the backlight unit 20 at a LED. 此外,如图11所示,例如, 背光单元20可以被使得具有以下配置:在屏幕中心设置一个温度传感器32和存储器(其中预先存储了在屏幕垂直方向上的温度分布模式,例如随后将描述的存储器49),以通过参考来自一个温度传感器32的检测值的内容,来估计在屏幕垂直方向上的各个位置处的温度。 Further, as shown in FIG. 11, for example, the backlight unit 20 has the following configuration may be such that: a temperature sensor 32 disposed in the center of the screen and the memory (wherein the temperature distribution pattern previously stored in the screen vertical direction, for example to be described later memory 49), by referring to the content from a detected value of the temperature sensor 32 to estimate the temperature at various locations on the screen in the vertical direction. 由温度传感器32检测的温度值被输送到用于驱动相应的发光二极管组的LFD驱动电路32。 32 from the temperature value detected by the temperature sensor is conveyed to the LFD for driving the respective light emitting diode drive circuit group 32.

此外,在背光单元20处,如图IO所示,例如提供了用于检测各个发光二极管组30中的各个颜色R、 G、 B的光量或色度的光量或色度传感器33 (33R,33G, 33B)。 Further, at the backlight unit 20, as shown in FIG IO, for example, it provided for each color R is detected in the respective light emitting diode group 30, G, and B light quantity or chromaticity of the light quantity or chromaticity sensor 33 (33R, 33G , 33B).

如图IO所示,多个光量或色度传感器33 (33R, 33G, 33B)被设置在与在水平方向上串联连接的发光二极管的组30相对应的各个垂直位置上。 FIG IO, a plurality of light amount or chromaticity sensor 33 (33R, 33G, 33B) is provided at each of the vertical position of the light emitting diode in series with the group 30 is connected in a horizontal direction corresponding to the. 此外,可以采用如下光学系统:其中使用用于允许整个颜色混合一致的慢射板等来有效地执行各个LED发射的光线的颜色混合等,以允许光量或色度传感器33 G3R,33G,33B)的数目只有一个。 Further, the optical system may be adopted as follows: wherein for allowing uniform mixing slowly the whole color reflection plate or the like efficiently perform the respective color mixing light emitted by the LED or the like, to allow light amount or chromaticity sensor 33 G3R, 33G, 33B) only a number.

注意,在LED被用作液晶的背光光源的情况下,存在以下实例:其中光量或色度传感器33出于布置和形状限制的原因而不能被放置在发光二极管组30的附近。 Note that the lower, is used as a backlight source of liquid crystal in the LED, the presence of the following examples: wherein the light quantity or chromaticity sensor 33 is disposed and reasons for limitations of the shape can not be placed in the vicinity of the light emitting diode group 30. 在光量或色度传感器33被放置在远离发光二极管组30的部分的情况下,它们将从发光二极管组30发射的光线作为弱光来检领IJ。 In the case of the light emitting diode disposed in a portion away from the set 30 of light quantity or chromaticity sensor 33, are set from the light emitting diode 30 emits light as a low-light specimen collar to IJ. 在光量或色度传感器33被放置在靠近发光二极管组30的部分的情况下,它们将从发光二极管组30发射的光线作为强光来检测。 In the light quantity or chromaticity sensor 33 is placed in a case where a portion near the light emitting diode group 30, which will be detected as a light emitting diode group 30 light emission. 在此情况下,通过利用参考发光二极管等执行光学仿真或实际测量,来计算光量或 In this case, by performing optical simulation or actual measurement using the reference light-emitting diode, or a light amount calculated

色度传感器33的特性,以预先准备好其校正值数据作为存储器表,从而 Characteristics of chromaticity sensor 33, which is ready to advance to the correction value data memory as a table, so that

基于该校正值数据来校正感应到的光量数据,这样使得可以顺应这种状况或不便。 Data based on the correction value to correct the sensed light amount of data, so that the situation can conform or inconvenience.

然后,用于驱动在水平方向上串联连接的发光二极管组30的LED驱动电路31将被说明。 Then, in the horizontal direction for driving the light emitting diode groups connected in series with the LED driving circuit 30, 31 will be explained. 在此情况下,LED驱动电路31被设置在背光驱动控制单元180中。 In this case, LED drive circuit 31 is provided in the backlight driving control unit 180.

LED驱动电路31的电路配置示例如图12所示。 A circuit configuration example of the LED drive circuit 31 is shown in Fig.

LED驱动电路31包含DC-DC变换器41、恒定电阻器(Rc) 42、 FET 43、 PWM控制电路44、电容器45、用于采样保持的FET 46、电阻器47、保持定时电路48、存储器49和CPU (中央处理单元)50。 LED drive circuit 31 comprises a DC-DC converter 41, a constant resistor (Rc) 42, FET 43, PWM control circuit 44, capacitor 45, the sample holding FET 46, a resistor 47 for holding a timing circuit 48, memory 49 and a CPU (central processing unit) 50.

LED驱动电路31被提供以一个或多个温度传感器32和光量或色度传感器33 G3R,33G,33B)的检测输出值。 LED drive circuit 31 is provided to one or more 33 G3R, 33G, 33B) of the detection output of the temperature sensor 32 and the light quantity or chromaticity sensor.

DC-DC变换器41被提供以从图2所示的光源110生成的DC电压VIN,以对输入的DC电力执行切换操作,以生成稳定的DC输出电压Vcc。 DC-DC converter 41 is supplied with a DC voltage VIN generated from the light source 110 shown in FIG. 2, the DC power input to perform a switching operation to generate a stabilized DC output voltage Vcc. DC-DC变换器41生成稳定的输出电压Vcc,使得从反馈端子Vf输入的电压与输出电压Vcc之间的电势差变得等于参考电压值(Vref)。 DC-DC converter 41 generates a stabilized output voltage Vcc, so that the value becomes equal to the reference voltage (Vref) from the potential difference between the voltage Vcc and the output voltage feedback terminal Vf input. 在该示例中,参考电压值(Vref)是从CPU50传递的。 In this example, the reference voltage value (Vref) is transmitted from the CPU50.

串联连接的发光二极管的组30的阳极侧通过恒定电阻器(Rc)被连接到DC-DC变换器41的输出电压Vcc的输出端子。 The anode side of the light emitting diode groups 30 connected in series is connected to the output terminal of DC-DC converter 41 output voltage Vcc via a constant resistor (Rc). 此外,串联连接的发光二极管的组30的阳极侧通过采样保持FET 46的源极-漏极,被连接到DC-DC变换器41的反馈端子。 Further, the anode side of the light emitting diode groups 30 connected in series source of FET 46 is maintained by sampling the source - drain is connected to the feedback terminal of the DC-DC converter 41. 此外,串联连接的发光二极管的组30的阴极侧通过源极和漏极之间的部分(沟道)而接地。 Further, the light emitting diode group 30 in series connection is grounded through the cathode-side portion (channel) between the source and the drain.

FET 43的栅极被提供以己从PWM控制电路44生成的PWM信号。 The gate of FET 43 is supplied to the PWM signal from the PWM control circuit 44 has generated. 当PWM信号处于ON状态时,FET 43的源极和漏极之间的部分(沟道) 导通。 When the PWM signal is in the ON state, a portion between the source and the drain of the FET 43 (the channel) is turned on. 当PWM信号处于OFF状态时,源极和漏极之间的部分(沟道)被关断。 When the PWM signal is in the OFF state, part (channel) between the source and the drain is turned off. 因此,当PWM信号处于ON状态时,FET 43允许电流在发光二极管组30中流动。 Thus, when the PWM signal is ON, FET 43 allows current to flow in the light emitting diode group 30. 当PWM信号处于OFF状态时,FET43使在发光二极管组30中流动的电流变为0。 When the PWM signal is in the OFF state, FET43 current flowing in the light emitting diode group 30 becomes zero. E卩,当PWM信号处于ON状态时,FET 43 使发光二极管组30发光。 E Jie, when the PWM signal is ON, FET 43 so that the LED group 30 emits light. 当PWM信号处于OFF状态时,FET43停止发光二极管组30发光的发光操作。 When the PWM signal is in the OFF state, FET43 stops emitting light emitting operation of light emitting diode groups 30.

PWM控制电路44生成PWM信号,该PWM信号是一种二值信号, 其中ON时间和OFF时间之间的占空比可被调整。 PWM control circuit 44 generates a PWM signal, the PWM signal is a binary signal, wherein the duty ratio between ON time and OFF time may be adjusted. PWM控制电路44被提供以来自CPU 50的PWM控制值,以根据PWM控制值来改变占空比。 PWM control circuit 44 is supplied from the PWM control value from the CPU 50, to vary the duty cycle of the PWM control value.

电容器45被设置在DC-DC变换器41的输出端子及其反馈端子之间。 Capacitor 45 is provided between the output terminal of the DC-DC converter 41 and the feedback terminal. 电阻器47被连接到DC-DC变换器41的输出端子以及采样保持FET 46的栅极。 Resistor 47 is connected to the output terminal of the DC-DC converter 41 and the gate of FET 46 of the sample holder.

保持定时电路48被提供以PWM信号,以生成保持信号,该保持信号仅在PWM信号的上升沿被切换到OFF —段预定时间,在其他时间都切换到ON。 Hold timing circuit 48 is supplied to a PWM signal, to generate a hold signal, which hold signal only at the rising edge of the PWM signal is switched to the OFF - a predetermined period of time, at other times are switched to ON.

采样保持FET 46的栅极被提供以已从保持定时电路48输出的保持信号。 Sample and hold gate of FET 46 is provided to a timing circuit 48 holding the output from the hold signal. 当保持信号处于OFF状态时,采样保持FET46的源极和漏极之间的部分(沟道)导通。 When the hold signal is in the OFF state, the sample holding portion between the source and the drain of FET46 (channel) is turned on. 当保持信号处于ON状态时,采样保持FET 46的源极和漏极之间的部分(沟道)被关断。 When the hold signal is in the ON state, the sample-hold section (channel) between the source and the drain of the FET 46 is turned off.

在如上所述的LED驱动电路31中,仅在从PWM控制电路44生成的PWM信号处于ON状态的时间段中使电流Ium在发光二极管组30中流动。 Ium current flows in the light emitting diode group 30 in the period of the LED driving circuit 31 described above, only the PWM signal from the PWM control circuit 44 generates a manipulation in the ON state. 此外,电容器45、采样保持FET 46和电阻器47构成采样保持电路。 Further, the capacitor 45, the sample holding FET 46 and a resistor 47 constitute a sample and hold circuit. 该采样保持电路用于在PWM信号处于ON状态时对发光二极管组30 的阳极(即,恒定电阻器42的未被提供输出电压Vcc的一端)的电压值采样,从而将这样采样的电压值输送到DC-DC变换器41的反馈端子。 The sample and hold circuit when the sampled voltage value for the PWM signal is in the ON state of the anode of the light emitting diode group 30 (i.e., resistor not provide a constant voltage Vcc output end 42), thereby conveying such sampled voltage values the DC-DC converter 41 of the feedback terminal. 由于DC-DC变换器41基于被输入到反馈端子的电压值,使输出电压Vcc稳定,因此在恒定电阻器Rc 42和发光二极管组30中流动的电流Iu2d的最顶点(峰)值变为恒定。 Since the DC-DC converter 41 based on the maximum value of the vertex is input to the feedback voltage terminal, the output voltage Vcc is stable, thus the flow constant resistor Rc 42 and the light emitting diode group 30 in the current Iu2d (peak) value becomes constant .

因此,在LED驱动电路31中,在流过发光二极管组30的电流Iled 的顶点(峰)值恒定的状态中执行与PWM信号相对应的脉冲驱动操作。 Thus, in the LED drive circuit 31, the flowing state apex (peak) value of the constant current Iled the light emitting diode group 30 performs the PWM pulse signal corresponding to the driving operation.

CPU 50用于基于一个或多个温度传感器32和光量或色度传感器33信号来调整在发光二极管组30中流动的电流量,以使从背光单元20发射的白光的色调(色温和色度)和辉度变为恒定。 CPU 50 based on one or more temperature sensors 32 and 33 or the chrominance signal light sensor to adjust the amount of flow in the light emitting diode group 30 in the current, so that the color tone (color temperature and chromaticity) of the white light 20 emitted from the backlight unit and the luminance becomes constant.

可以通过改变PWM控制值以调整在发光二极管组30中流动的电流的占空比,可以通过改变被输送到DC-DC变换器41的参考电压值(Vref)以调整在发光二极管组30中流动的电流的顶点(峰)值,或者可以通过这些调整方法的组合,来执行对在发光二极管组30中流动的电流值的调整。 By changing the duty cycle of the PWM control to adjust the value of the current flowing in the light emitting diode group 30 may be conveyed by varying the DC-DC converter 41, the reference voltage value (Vref) to adjust the flow of the light emitting diode group 30 vertex (peak) value of the current, or may be performed to adjust the value of the current flowing in the light emitting diode group 30 is adjusted by a combination of these methods.

如上所述,CPU 50基于一个或多个温度传感器32和光量或色度传感器33 (33R, 33G, 33B)两者的检测信号,对发光二极管组30发光的光线强度执行反馈控制,从而使生成在图像内具有均匀色度和辉度的白光成为可能。 As described above, CPU 50 based on one or more temperature sensors 32 and a light quantity or chromaticity sensor 33 (33R, 33G, 33B) of both of the detection signal, performs feedback control of the LED's 30 emission intensity of the light, thereby generating white light having uniform chromaticity and luminance in the image as possible.

这里,使用温度传感器32的检测输出值来控制发光二极管发光的强度的原因将被说明。 Here reasons of strength, the use of the output value of temperature sensor 32 to control the light emitting diode will be described.

首先,将参考图13到图15来说明LED元件的温度特性。 First, with reference to FIGS. 13 to 15 will be described temperature characteristics of the LED element.

图13是示出各个红色(R)、绿色(G)和蓝色(B) LED元件的相对辉度值的图。 13 is a diagram illustrating each of the red (R), green (G) and blue (B) showing the relative luminance value of an LED element. 在图13的图中,在x轴方向上指示LED元件温度,在y 方向上指示相对辉度,并且使元件温度25。 In FIG. 13, indicated on the x-axis direction of the LED element temperature, indicates a relative luminance in the y-direction, and the temperature of the element 25. C点处的相对辉度为100%。 Relative luminance at the point C is 100%.

红色(R) LED元件具有AlInGaP的四元素系统的半导体分层结构。 Red (R) LED element having a semiconductor layered structure of the four-element system AlInGaP. 由于带隙能量低,因此对于发光有贡献的载流子在高温时减少。 Due to the low band gap energy, thus reducing the contribution to light emission for the carriers at high temperatures. 因此,被发射的光量被降低。 Thus, the amount of light emitted is reduced. 这样一来,在通常作为LED元件的运行(工作)温度的大约70°C的状态下,辉度值被降低到当25。 Thus, in a state where the LED element is normally operating (working) temperatures of about 70 ° C, the luminance value is reduced to 25 when the. C被设置为正常温度时的大约60%。 About 60% of C is set to normal temperature. 此外,在红色(R)的LED元件中,辉度值相对于温度的改变比其他颜色更大。 Further, in the red (R) LED element, the luminance values ​​with respect to a change in temperature is larger than other colors.

另一方面,在具有InGaN的三元素系统的半导体分层结构的绿色(G) LED元件和蓝色(B) LED元件中,这些LED元件具有比红色(R) LED元件更短的波长,因此它们的颜色变得更紫。 On the other hand, the green (G) LED element, and a blue (B) LED element having InGaN semiconductor layered structure of the three elements of the system, these elements having LED elements shorter than red (R & lt) of the LED wavelength, their color becomes more purple. 因此,带隙能量很大。 Thus, a large band gap energy. 因此,这些LED元件变得难以受到温度的影响。 Thus, the LED elements becomes difficult to be affected by temperature.

如上所述,将会理解,LED元件的光线的量是这样的,即不同颜色的 As described above, it will be appreciated that the amount of light of the LED elements is such that the different colors

17温度特性有所不同。 17 different temperature characteristics.

图14是示出各个红色(R)、绿色(G)和蓝色(B) LED元件的亮度相对于发光波长的图。 14 is a diagram illustrating each of the red (R), green (G) and blue (B) LED elements with respect to the luminance of a light emitting wavelength. 图14中示出了温度为0。 FIG 14 shows a temperature of 0. C、 25。 C, 25. C和50。 C and 50. C的各情况下的图。 FIG C, in each case. 在此情况下,在图14的图中,在x轴方向上指示发光波长, 而在y轴方向上指示发光输出(亮度)。 In this case, in FIG. 14, the indication light emission wavelength in the x-axis direction, the indication light-emitting output (luminance) in the y-axis direction.

如参考图14所理解的,在各个LED元件中,不仅发光量相对于温度(由曲线包围的部分的区域)改变,而且波长随温度上升朝着长波长一侧平移。 As it appreciated with reference to FIG. 14, each of the LED elements, not only the amount of light emission with respect to the temperature (the region surrounded by the curve portion) changes, and the temperature rises wavelength side toward the long wavelength translation. 具体而言,在红色(R) LED元件中,与山形顶点(峰)(峰值波长)相对应的波长随着温度上升朝着长波长一侧平移。 Specifically, in the red (R) LED element, and the chevron apex (peak) (peak wavelength) corresponding to the wavelength as the temperature increases toward the longer wavelength side translation.

从上述图13和图14可知,LED元件的温度特性取决于各个颜色会有极大改变。 From the above FIG 13 and FIG 14, the temperature characteristics of the LED element will be greatly changed depending on the respective colors. 具体而言,将会理解,蓝色(B) LED元件具有这样的特性: 辉度值相对于温度改变几乎不改变,并且波长相对于温度改变的改变很小,而另一方面,红色(R) LED元件具有这样的特性:辉度值相对于温度改变的改变很大,并且波长相对于温度改变的改变也很大。 Specifically, it will be appreciated that the blue (B) LED element having a characteristic that: the luminance value hardly changes with respect to temperature changes, and the wavelength change relative to temperature change is small, on the other hand, a red (R ) LED element having a characteristic that: a large luminance value change with respect to temperature changes, and the wavelength with respect to temperature changes is also changed greatly.

图15示出了当从具有上述特性的红色(R) LED元件、绿色(G) LED元件和蓝色(B) LED元件发射的光线在背光单元20处被组合以在光学上执行合成加法混色以获得白光时,白色色度(Cffi色度坐标显示(x, y))的温度偏差。 FIG 15 illustrates when to perform optically from red having the above characteristics (R & lt) LED element, green (G) LED element, and a blue (B) light from the LED elements emitted at the backlight unit are combined in an adder 20 Synthesis of mixing when to obtain white light, the white chromaticity (Cffi display chromaticity coordinates (x, y)) of the temperature deviation. 在此情况下,图15所示的特性是在基于色度传感器的光量和温度的反馈控制被停止的状态下被测量的。 In this case, the characteristics shown in FIG. 15 is a feedback based on the amount of light and color temperature sensor is stopped under the control of the state is measured. 如图15所示,当温度从35°C上升到60°C时,白光的色度具有以下偏差:Y的偏差(Ay值) 变得等于+0.0025,而X的偏差(Ax值)变为等于-0.015。 As shown, when the temperature rises from 35 ° C to 60 ° C, the white light 15 having the chromaticity deviation: Y deviation (Ay value) becomes equal to +0.0025, and the variation X (Ax value) becomes equal to -0.015. 可以理解,白色的色度对应于以下趋势:在图14所示的相对于红色(II) LED元件的温度改变的特性中,与山形顶点(峰)(峰值波长)相对应的波长随温度上升而朝着长波长一侧平移。 It will be appreciated, the white chromaticity correspond to the following trends: In the phase characteristics shown in FIG. 14 for a temperature change of the red (II) LED element, and the chevron apex (peak) (peak wavelength) corresponding to the wavelength with increasing temperature It is translated toward the longer wavelength side.

LED元件具有上述温度特性。 LED element having the above temperature properties.

这样的LED元件具有很大的温度依赖性,并且它们的特性会依赖于颜色而有所不同。 Such an LED element having a large temperature dependency, and their properties will vary dependent color. 出于这个原因,要求CPU 50也通过使用温度传感器32 来执行控制,以便允许从背光单元20发射的白光的色调(色温和色度) 保持恒定。 For this reason, also requires CPU 50 by using the temperature sensor 32 performs control so as to allow hue (color temperature and chromaticity) of the white light emitted from the backlight unit 20 remains constant. 此外,为了允许从背光单元20发射的白光的色调(色温和色度)保 Further, in order to allow the tone emitted from the backlight unit 20 of white light (color temperature and color) protection

持恒定,CPU 50需要利用光量传感器来检测红色(R)、绿色(G)和蓝色(B)的各个颜色的各个发光量,以综合地控制红色(R)、绿色(G) 和蓝色(B)的发光量。 Remains constant, CPU 50 needs to be detected by the light amount sensor red (R), the amount of each of the respective emission colors green (G) and blue (B) to control the red (R) integrated manner, green (G) and blue (B) an amount of light emission. g卩,不采用通过仅参考红色(R)的光量传感器输出来执行对红色(R)发光量的反馈控制的方法,而是需要通过参考也包括其他颜色的所有颜色(红色(R)、绿色(G)和蓝色(B))的光量传感器输出来执行对红色(R)发光量的反馈控制。 g Jie, is not employed to perform the method of feedback light emission amount (R) Red controlled by reference to red (R) light amount sensor outputs only, but rather by reference including all colors other colors (red (R), green (G) and blue (B)) of the light amount sensor output to perform feedback control of the light emission amount (R) red.

因此,CPU50基于如以下式(1)指示的含有三行和三列的矩阵运算表示来执行运算(计算),以综合调整各个颜色(R, G, B)的LED元件的发光量。 Thus, the CPU 50 based on the following formula as comprising three lines (1) and a matrix operation indicated by three columns represent performs operation (calculation), the overall adjustment to the respective colors (R, G, B) light emission amount of the LED element.

[1]<formula>formula see original document page 19</formula>(1) [1] <formula> formula see original document page 19 </ formula> (1)

在式(1)中,"X" 、 "Y"和"Z"代表从背光单元20发射的光线的色度坐标。 In formula (1), "X", the chromaticity coordinate "Y" and "Z" representative of emitted light from the backlight unit 20. 此外,在式(1)中,"Lr"指示光量或色度传感器33的红色分量的检测输出值,"Lg"指示光量或色度传感器33的绿色分量的检测输出值,而"Lb"指示光量或色度传感器33的蓝色分量的检测输出值。 Further, in the formula (1), "Lr" detection output value indicative of the amount of light or the red component of the color sensor 33, "Lg" detection output value of green component indicates the light quantity or chromaticity sensor 33, while "Lb" indicates light amount detection output value or chrominance blue component sensor 33.

此外,处于式(1)右侧的前一矩阵是由三行X三列的系数nv构成的矩阵A,该矩阵A是被乘以光量或色度传感器33的检测输出值(Lr, Lg, Lb)的系数矩阵。 Further, the front matrix is ​​a three-row X three nv coefficient matrix A is composed of the formula (1) to the right of the matrix A is multiplied by the light quantity or chromaticity sensor detection output value (Lr, Lg 33, and Lb) coefficient matrix. (在此情况下,m的下标x是l、 2、 3,其指示对应于该系数的系数行号,而m的下标y是l、 2、 3,其指示对应于该系数的系数列号。)矩阵A在理想情况下应该被表示为常数。 (In this case, m subscript x is l, 2, 3, indicating that corresponding to the coefficients of the coefficient row number, and m is the subscript y is l, 2, 3, indicating that the coefficient corresponding to the coefficient column number.) Ideally matrix A should be expressed as a constant. 但是,由于如上所述,各个颜色的LED元件实际上具有温度特性,因此矩阵A是通过用如下的矩阵C乘以矩阵B而获得的矩阵:矩阵C由三行X三列的常数jxy表示,而矩阵B由使用LED元件的温度T作为参量的函数kJT)构成,其用于消除温度特性。 However, since as described above, the respective colors of LED elements in fact has a temperature characteristic, so the matrix A is a matrix by multiplying matrix B by the following matrix C is obtained: X matrix C is represented by three rows and three columns jxy constant, matrix B and the temperature T of using an LED element as a function of parameters KJT) configured for eliminating temperature characteristic. <formula>formula see original document page 20</formula>就是说,CPU50基于式(1),利用温度传感器32的检测输出(T) 以及光量或色度传感器33的检测输出(Lr, Lg, Lb),来执行反馈控制,以使白光的色调(色温和色度)变为恒定。 <Formula> formula see original document page 20 </ formula> That is, the CPU 50 based on Equation (1), using the detection output (T) of the temperature sensor 32 and a light quantity or chromaticity sensor 33 of the detection output (Lr, Lg, Lb) , hue (color temperature and chromaticity) performs feedback control so that the white becomes constant.

在该示例中,作为矩阵B的分量的函数kxy(T)值和作为矩阵C的分量的系数jxy是在从工厂出货或寄出前预先通过实验或测量计算出的,并被存储在是非易失性存储器的存储器49中。 In this example, the component B matrix as a function of kxy (T) of value as a component of the coefficient matrix C jxy is to be sent or before shipment from the factory or measured experimentally in advance calculated and stored in the non-Yi the volatile memory 49 of the memory.

用于执行上述运算(计算)和控制的CPU50的实际操作如下所述。 For performing the above operation (calculation) and actual operation of the CPU50 as control.

在背光单元20工作期间,CPU50以合适的时间段(例如每隔预定的时间段或在所有时间)执行对背光单元20的色度和辉度的调整控制。 During the work of the backlight unit 20, CPU50 a suitable period of time (e.g. at intervals of a predetermined period of time or all the time) and chroma adjustment control is performed on the luminance of the backlight unit 20.

当CPU 50开始对背光单元20的色度和辉度的调整控制时,它读出一个或多个温度传感器32和光量或色度传感器33的输出,并从存储器49 调用(读出)函数kxy和系数jxy。 When the CPU 50 starts control for adjusting chroma and luminance of the backlight unit 20, which reads the output of one or more temperature sensor 32 and the light quantity or chromaticity sensor 33, and (read) from the memory 49 calls the function kxy and coefficient jxy.

CPU 50操作来将已由一个或多个温度传感器32检测出的一个或多个温度代入上述式(1)和(2)中的T,并将光量或色度传感器33的检测值代入上述式(1)和(2)中的Lr、 Lg、 Lb,以计算背光单元20的各个颜色的色度(X, Y, Z)。 The operation of the CPU 50 detected by the temperature sensor 32 of one or more one or more temperature into the above formula (1) and (2) T, and the detected light quantity or chromaticity sensor 33 values ​​are substituted into the above formula (1) and (2) Lr, Lg, Lb, to calculate the backlight unit 20 for each color chromaticity (X, Y, Z).

此外,CPU 50调整在各个颜色的LED元件中流动的电流值(PWM 占空比或顶点值),以使这样计算出的色度(X, Y, Z)等于被存储在存 Further, the current value flowing in the CPU 50 to adjust the respective colors of the LED elements (PWM duty cycle value or vertices), so that the thus calculated chromaticity (X, Y, Z) stored in the memory is equal to

储器49等中的值,在所述存储器49中存储有在从工厂 The value of the reservoir 49 and the like, there are from the factory stored in the memory 49

j」化 j "of

或寄出前设置 Or mailed before setting

的特定设置值,例如理想值。 Setting a specific value, for example, the ideal value.

这样,CPU 50允许从背光单元20发射出的白光的色调(色温和色 Thus, CPU 50 allows the white light emitted from the backlight unit 20 of the color tone (color temperature and color

度)在所有时间都保持恒定。 Degrees) remains constant at all times.

图16A是示出在只利用光量或色度传感器33执行色度控制而不利用温度传感器32执行反馈控制的情况下(传统方法的情况),从背光单元20发射出的白光的色度(CIE色度坐标显示(x, y))的温度偏差。 16A is a diagram illustrating the use of white light in the case where only the light amount sensor 33 performs chroma or chromaticity control without using the temperature sensor 32 performs feedback control (in the case of the conventional method), emitted from the backlight unit 20 chromaticity (CIE display chromaticity coordinates (x, y)) of the temperature deviation. 此外, 图16B是示出在利用温度传感器32和光量或色度传感器33两者的反馈控制被执行以执行色度控制的情况下(本发明的方法的情况),从背光单元20发射出的白光的色度(CIE色度坐标显示(x,y))的温度偏差。 Further, FIG. 16B is a diagram illustrating the temperature sensor is performed at 32 and 33 of both the feedback control sensors to the light quantity or chromaticity case of performing chroma control (in the case of the method of the present invention), emitted from the backlight unit 20 white chromaticity (CIE chromaticity coordinates of the display (x, y)) of the temperature deviation.

如图16A所示,在只利用光量或色度传感器33执行色度控制的情况下,Ay值是+0.0010而Ax值是-0.0015,作为从25°C到50°C范围内的偏差。 16A, in the case of using only the light amount sensor 33 performs chroma or chromaticity control, Ay and Ax value is a value of -0.0015 +0.0010, a deviation from 25 ° C to 50 ° C range. 将会理解,该特性与图15所示的特性相比,在Ay值方面改善了1/5,而在Ax值方面改善了1/10。 It will be appreciated, compared with the characteristic of the characteristic shown in FIG. 15, the improved value 1/5 aspect Ay, Ax improved values ​​in terms of 1/10.

此外,在利用温度传感器32和光量或色度传感器33两者执行反馈控制以执行色度控制的情况下,如图16B所示,Ay值是+0.0005而Ax值是-0.0005,作为从25°C到50°C范围内的偏差。 Further, in the case where both the feedback control is performed to perform the chromaticity control by the temperature sensor 32 and the light quantity or chromaticity sensor 33, as shown in FIG. 16B, Ay and Ax value is a value of -0.0005 +0.0005 as from 25 ° deviations in the C to 50 ° C range. 将会理解,该特性与图15 所示的特性相比,在Ay值方面改善了1/2,而在Ax值方面改善了1/3, 因此实现了进一步的特性改善。 It will be appreciated, compared with the characteristic of the characteristic shown in FIG. 15, the value of Ay improved in terms of 1/2, 1/3 is improved in terms of the value Ax, thus achieving a further improvement in properties.

如上所述,根据本发明应用到的背光单元20,由于基于一个或多个温度传感器32和光量或色度传感器33 G3R, 33G, 33B)两者的检测信号,将被发射的白光的色调(色温和色度)和辉度被使得恒定,因此可以以高准确度地发射具有稳定色调的光线。 As described above, 20, since based on one or more of 33 G3R, 33G, 33B) of the two detection signals, to be transmitted white color temperature sensor 32 and the light quantity or chromaticity sensor according to the present invention is applied to a backlight unit ( color temperature and color), and luminance that is constant, light having a stable tone color can be emitted at high accuracy.

然后,将说明背光驱动控制单元180的配置。 Then, the configuration will be described backlight driving control unit 180. 如图17所示,背光驱动控制单元180包括上述多个LED驱动电路31, LED驱动电路31被提供以来自电源110的电压,其用于将AC电压转换成DC电压以驱动发光二极管组30。 As shown in FIG 17, the backlight drive control unit 180 includes a plurality of the above-described LED driving circuit 31, LED drive circuit 31 is supplied with a voltage from a power source 110 for converting the AC voltage into a DC voltage to drive the LED group 30.

在图17中,组gl指示最上面一行的组,其包含红色发光二极管组30 (Rl)、绿色发光二极管组30 (Gl)和蓝色发光二极管组(Bl)。 In Figure 17, the top line indicates the group gl of the group comprising red LED group 30 (Rl), the green LED group 30 (Gl) and a blue light emitting diode set (Bl). 组g2 指示位于组gl下面一行处的组,其包含红色发光二极管组30 (R2)、绿色发光二极管组30 (G2)和蓝色发光二极管组30 (B2)。 Group g2 indicating group is located at the following groups gl line, which includes a red LED group 30 (R2), green LED group 30 (G2), and a blue LED group 30 (B2). 另外,图17 以模型形式示出了在PWM信号被输送到各行发光二极管组30时,驱动宽度之间的差异。 Further, FIG. 17 shows a model form is delivered to the difference between the width of each row drive light emitting diode set 30, the PWM signal.

这里,由背光驱动控制单元180执行的对发光二极管组30的PWM 驱动操作将被说明。 Here, the backlight drive control unit 180 performs will be explained the operation of the PWM driver 30 of the light emitting diode group. 首先,关注蓝色(B) LED元件。 First, attention blue (B) LED element. 由于蓝色(B) LED元件在发光效率方面有困难,因此使得PWM信号的ON时间被使得大于红色(R) LED元件和绿色(G) LED元件的发光周期,以补足或补偿光量方面的不足。 Since the blue (B) LED elements have difficulties in emission efficiency, so that the ON time of the PWM signal is made larger than the red (R) light emission period of the LED element, and green (G) LED element, is insufficient to make up or compensate the optical quantity terms . 此外,在gl行的Blp的PWM信号的驱动宽度和g2行的B2p的PWM信号的驱动宽度之间几乎不存在差异。 Further, there is almost no difference between the width of the driving B2p driving rows g2 and Blp width of the PWM signal line gl PWM signal. 这是因为由于gl行在显示器上位于g2行上方,从而具有高温度,但是被关注的LED元件是蓝色(B) LED元件,其由于温度依赖性引起的发光改变较小,因此无需使驱动宽度有所不同。 This is because the on-line gl g2 located above the line display such a high temperature, the LED elements are concerned that the blue (B) LED element, light emission due to the temperature dependence of change due to small, it is not necessary that the driving the width is different.

然后,关注红色(R) LED元件。 Then, attention red (R) LED element. 由于红色(R) LED元件具有良好的发光效率,因此PWM信号的ON时间段与蓝色(B) LED元件相比被縮短。 Since the red (R) LED element having a good light emitting efficiency, and the ON period of blue (B) LED elements as compared with the PWM signal is shortened. 此外,gl行的Rip的PWN信号的驱动宽度与g2行的R2p的PWM信号的驱动宽度之间的差异k很大。 Further, the difference between the width of the driving R2p and the width of the drive signal g2 row PWN Rip the PWM signal line gl k big. 这是因为由于gl行在显示器上位于g2行上方,从而温度很高,并且被关注的LED元件是红色(R) LED元件,其由于温度依赖性引起的发光量改变较大,因此必须使驱动宽度有所不同。 This is because the display is located on the upper row g2 gl row, whereby the high temperature, and the LED elements are concerned red (R & lt) LED element, because its light emission amount changes due to temperature dependency is large, it is necessary to drive the width is different. 背光驱动控制单元180执行驱动操作,以使gl行处PWM 信号的脉宽在温度很高时变大,以便实现相对于其他行的组的光量平衡。 The backlight driving control unit 180 performs driving operation, so that the pulse width of the PWM signal line gl at very high temperatures becomes large, so as to achieve the amount of light with respect to the other group of line balance.

背光驱动控制单元180被装配为使PWM信号的ON时间段的差异被用作改变发光量的技术,以使显示器的温度分布保持一致,从而使确保显示器内温度特性的一致性变得可能。 The backlight driving control unit 180 is equipped to make a difference in the ON period of the PWM signal is used to change the amount of light emitted in the art, so that the temperature distribution of the display remains the same, so ensuring temperature uniformity within the display characteristics becomes possible.

然后,用于调整各个颜色的分辨率的操作将被说明。 Then, the operation for adjusting the resolution of the respective colors will be described.

图18A到18C是示出PWM信号的分辨率的波形图。 18A to 18C are waveform diagrams illustrating the resolution of the PWM signal. 图18A示出了被输送到红色(R)发光二极管组30的PWM信号的波形图,图18B示出了被输送到绿色(G)发光二极管组30的PWM信号的波形图,而图18C 示出了被输送到蓝色(B)发光二极管组30的PWM信号的波形图。 18A shows a waveform of the PWM signal is supplied to the red (R) light emitting diode group 30, FIG. 18B shows a waveform diagram to be supplied to the PWM signal green (G) light emitting diode group 30, and FIG. 18C shows a waveform diagram blue (B) light emitting diode group 30 is fed to the PWM signal.

作为从红色(R) LED元件发射的光线、从绿色(G) LED元件发射的光线和从蓝色(B) LED元件发射的光线的混合比被调整以获得预定白光这一事实的结果,如图18A到18C所示,可以在出现如下混合比时获得预定白光:其中被输送到蓝色(B)发光二极管组30的PWM信号的脉宽为256 (大约100%),被输送到绿色(G)发光二极管组30的PWM信号的脉宽为191 (大约75%),而被输送到红色(R)发光二极管组30 的PWM信号的脉宽为126 (大约50%)。 As the light emitted from the red (R & lt) LED element, light emitted from the green (G) LED element, and the blue (B) LED element emitting the light mixing ratio is adjusted to obtain a predetermined result of the fact that a white light, such as as shown in, FIGS. 18A to 18C can be obtained as follows when the mixing ratio of the occurrence of a predetermined white: wherein is conveyed to the blue (B) the pulse width of the PWM signal 30 is a light emitting diode group 256 (about 100%), it is transported to the green ( G width) of the PWM signal 30 is a light emitting diode group 191 (about 75%) and the pulse width of the PWM signal is delivered to the red (R) light emitting diode group 30 is 126 (about 50%).

此外,在上述示例中,在被输送到各个发光二极管组30的PWM信号的脉宽的调整宽度被设置为8位的情况下,被输送到蓝色(B)发光二极管组30的PWM信号的脉宽的自由度可以以1/256步(Step)来调整, 如图18C所示。 Further, in the above example, is provided to adjust the width of the pulse width of the PWM signal is supplied to the respective light emitting diode group 30 is 8-bits, is transported to the blue (B) light emitting diode PWM signal is set 30 the degree of freedom of the pulse width may be adjusted in steps of 1/256 (step), shown in Figure 18C. 但是,被输送到红色(R)发光二极管组30的PWM信号的脉宽的自由度只可以以1/126步(大约一半)来调整。 However, the pulse width is supplied to the red (R) PWM signal, the LED's 30 may be adjusted to the degree of freedom only 1/126 step (about half). 此外,存在以下不便之处:被输送到蓝色(B)发光二极管组30的PWM信号的脉宽的1 步变得等于被输送到红色(R)发光二极管组30的PWM信号的脉宽的1 步的两倍的值。 Furthermore, there is inconvenience: to be delivered to the blue (B) light emitting diode set a step width of the PWM signal becomes equal to 30 is conveyed to the red (R) light emitting diode set the pulse width of the PWM signal is 30 twice the value one step. 这从确保调整准确度的角度来看是不方便的。 This adjustment to ensure accuracy from the point of view is inconvenient.

为了避免这样的不便之处,必须提高调整宽度的分辨率。 In order to avoid the inconvenience such, the resolution must be increased to adjust the width. 例如,存在允许被输送到蓝色(B)的发光二极管组30的PWM信号的脉宽的调整宽度为IO位的技术。 Adjust the width of the pulse width, for example, is allowed to be conveyed to the presence of blue (B) of the PWM signal for the LED's 30 IO bits in the art. 但是,在各个发光二极管组30的调整步数之间存在差异。 However, there is a difference between the number of steps 30 to adjust the respective light emitting diode group. 由于在原理上没有执行改进,因此当PWM信号的ON时间段的差异达到50%时,被输送到红色(R)发光二极管组30的PWM信号的脉宽的调整宽度将以对应于l位的值恶化。 Since improvements in principle it is not performed, so when the difference of the ON period of the PWM signal is 50%, is delivered to the red (R) light emitting diode set pulse width adjusted PWM signal 30 will correspond to the l-bit value deterioration. 另外,当调整分辨率变为等于10位或更大时,用于执行处理等的变换器变得很昂贵,从而会提高设备本身的成本。 Further, when adjusting the resolution becomes equal to 10 or greater, for performing processing such as the converter becomes expensive, which will increase the cost of the device itself.

鉴于此,如图19A到19B所示,背光驱动控制单元180调整从DC-DC 变换器输送到各个发光二极管组30 的信号的顶点(峰)值(恒定电流值ILED),以使被输送到各个发光二极管组30的PWM信号的调整宽度基本一致(例如8位)。 In view of this, as shown in FIG. 19A to 19B, the backlight drive control unit 180 to adjust the DC-DC converter fed from the vertex to the respective signal group 30 of the light emitting diode (peak) value (constant current value ILED), so to be conveyed adjust the width of the PWM signal of each light emitting diode 30 is basically the same group (e.g., 8). 被输送到红色(R)发光二极管组30的PWM信号的波形图如图19A所示,被输送到绿色(G)发光二极管组30的PWM 信号的波形图如图19B所示,被输送到蓝色(B)发光二极管组30的PWM信号的波形图如图19C所示。 Is delivered to the waveform diagram shown in FIG. 19A PWM signal red (R) light emitting diode group 30, is conveyed to the waveform of the PWM signal of green (G) light emitting diode group 30 in FIG. 19B, is conveyed to blue color (B) signal waveform of the PWM light emitting diode group 30 in FIG. 19C.

背光驱动控制单元180对从例如DC-DC变换器输送到各个发光二极管组30的信号执行PAM (脉冲幅度调制),以调整被输送到各个发光二极管组30的恒定电流值ILED的顶点(峰)值。 The backlight driving control unit 180 pairs from the DC-DC converter, for example, signals supplied to perform PAM (pulse amplitude modulation) of the respective light emitting diode set 30, to adjust the constant current value of the respective light emitting diode group 30 ILED apex (peak) is delivered to the value. 因此,背光驱动控制单元180在时间方向上和在顶点值的方向上对被输送到各个发光二极管组30的信号执行调整,以确保在调整时的准确度,从而使维持各个发光二极管组30的调整准确度的平衡成为可能。 Thus, the backlight drive control unit 180 in the time direction and in the direction of the vertex values ​​of the signals supplied to perform adjustment of the respective light emitting diode group 30, to ensure accuracy in adjustment, thereby maintaining the respective light emitting diode group 30 balance adjustment accuracy possible.

这里,当被输送到发光二极管组30的信号被调整时的信号波形的实际示例如下所示。 Here, when a signal is supplied to the light emitting diode group 30 when an actual example of a signal waveform is adjusted as follows. 图20A示出了当在时间方向上的信号被调制(PWM被执行)而在幅度方向上的信号未改变(固定),即LED元件的峰值电流未改变的情况下的信号波形。 FIG 20A shows in the time direction when the signal is a signal waveform in the case where modulation (PWM is performed) and the signal in the amplitude direction is not changed (fixed), i.e., the peak current of the LED element unaltered. 此外,图20C示出了当在时间方向(PWM 方向上)的信号固定而只有在幅度方向上的信号被调制的情况下的信号波形。 Further, FIG. 20C shows the case when the signal in the time direction (the direction PWM) signal is fixed and only the amplitude direction in the case where the modulated signal waveform. 此外,图20B示出了当在时间方向上的信号被调制而在幅度方向上的 Further, FIG. 20B shows the time direction when the signal is modulated in amplitude and direction

信号也被调制在情况下的信号波形。 Modulated signal is also a signal waveform in the case.

注意,在例如可利用白平衡等来集中调整辉度的情况下,背光驱动控制单元180在时间方向上执行调制(PWM),并且幅度方向上的调制(PAM)可被执行,以利用显示器的温度分布来校正发光输出。 Note that, in the case of, for example, may be utilized to centrally adjust the white balance luminance of the backlight driving control unit 180 performs modulation (PWM) in the time direction, and the modulation (PAM) in the width direction can be performed to use the display the temperature distribution is corrected luminous output.

在调整构成背光单元2的发光二极管组30的发光操作时,根据本申请中的发明以这种方式构成的背光驱动控制单元180在幅度方向和时间方向上执行调整,以使在各个颜色的所有发光二极管组30中的调整分辨率变得一致。 When adjusting the light emitting diode backlight unit 2 of the group consisting of light emitting operation 30, the backlight drive control unit in accordance with all applications of the present invention constructed in this manner in the amplitude adjustment is performed 180 and time directions so that the respective colors a light emitting diode group 30 is adjusted the resolution becomes uniform.

另外,由于根据本申请的发明的背光驱动控制单元180适当地检测从显示器上部朝着显示器下部延伸的温度分布,以基于检测结果执行在幅度方向上的调整,从而执行对被输送到发光二极管组30的电流值的峰值控制,因此可以利用显示器的温度分布来消除显示的不均匀性。 Furthermore, since properly detected towards the temperature distribution of the lower display extending from the upper portion of the display, based on the detection result of the amplitude adjustment is performed in accordance with the direction of the backlight driving control unit 180 of the invention of the present application, so as to perform a light emitting diode set is delivered controlling the peak current value is 30, so the display may be utilized to eliminate the temperature distribution in the display unevenness.

注意,己根据附图中示出并被详细描述的本发明的优选实施例描述了本发明,但是本领域普通技术人员应该理解,本发明并不局限于这些实施例,在不脱离由所附权利要求书提出并限定的本发明的范围和精神的情况下,可以实现各种修改、替换结构或等同物。 Note that embodiments of the present invention described in the present invention preferably has shown in the drawings and described in detail in accordance with, those of ordinary skill in the art should be understood, the present invention is not limited to these embodiments, without departing from the appended case forth in the claims and the scope and spirit of the invention as defined can be various modifications, alternative constructions or equivalents thereof.

24 twenty four

Claims (13)

  1. 1.一种用于背光单元的驱动设备,在所述背光单元中,由三原色的发光二极管元件构成的多个发光二极管元件组被布置在不同部分,其中每个所述发光二极管元件组由具有相同颜色的发光二极管元件串联连接而成, 所述驱动设备包括: PWM控制电路,用于生成PWM信号,该PWM信号用于控制用于驱动所述发光二极管元件组的FET的导通/关断; 所述FET,用于基于已由所述PWM控制电路生成的PWM信号,在导通期间驱动所述发光二极管元件组发光; 电压供应装置,用于向所述发光二极管元件组供应电压; 发光量检测装置,用于检测从已被供应了电压的发光二极管元件组发射的光线的量; 温度检测装置,用于检测所述发光二极管元件组的一个或多个温度;以及CPU,用于基于已由所述发光量检测装置检测到的发光量和已由所述温度检测装置检测到的一个或多个温度 1. A driving apparatus for a backlight unit, the backlight unit, a plurality of light emitting diode elements the group consisting of light emitting diode elements of three primary colors are arranged in different portions, wherein each of said light emitting diode element having the group consisting of the same color light emitting diode elements connected in series, said driving apparatus comprising: PWM control circuit for generating a PWM signal, the PWM signal for controlling the FET for driving the light emitting diode element group is turned on / off ; the the FET, based on the PWM control by the PWM signal generating circuit, during the on-driving the light emitting diode light emitting element group; a voltage supply means for supplying a voltage to said light emitting diode element group; emission amount detecting means for detecting an amount which has been supplied from the light emitting element group emit light diode voltage; a temperature detecting means for detecting a temperature of the one or more light emitting diode element group; and the CPU, based on the amount of light emitted by the detecting means detects the amount of light emitted by the temperature detecting means detects said one or more temperature 至少控制所述PWM控制电路,以生成适当的所述PWM信号。 Controlling at least the PWM control circuit to generate the appropriate PWM signal.
  2. 2. 如权利要求1所述的用于背光单元的驱动设备,其中,所述各个发光二极管元件组被布置在其中所述串联连接的多个LED元件具有相同的温度的区域中。 2. A driving apparatus for a backlight unit according to claim 1, wherein each of said light emitting diode elements are arranged in groups wherein the plurality of LED elements connected in series with the temperature in the region of the same.
  3. 3. 如权利要求2所述的用于背光单元的驱动设备,其中,所述各个发光二极管元件组被装配为使得所述串联连接的多个发光二极管元件被布置在水平方向上。 A backlight unit driving apparatus according to claim 2, wherein said respective group of light emitting diode elements are mounted such that the plurality of light emitting diode elements connected in series are arranged in the horizontal direction.
  4. 4. 如权利要求1所述的用于背光单元的驱动设备,其中,所述发光量检测装置检测已从包括任意一种原色的发光二极管元件的发光二极管元件组发射的光线的量。 4. A driving apparatus for a backlight unit according to claim 1, wherein said detecting means detects the amount of light emission from the light emitting diode element group comprising an amount of light emitted from the light emitting diode device of any one of the primary colors.
  5. 5. 如权利要求1所述的用于背光单元的驱动设备,包括:存储器,在所述存储器中存储了通过预定的实际测量方法获得的校正值数据,使得在所述发光量检测装置被布置在远离所述发光二极管元件组的位置的情况下,所述发光量检测装置将所述发光二极管元件组所发射的光线作为弱光来检测,而在所述发光量检测装置被布置在靠近所述发光二极管元件组的位置的情况下,所述发光量检测装置将所述发光二极管元件组所发射的光线作为强光来检测,其中,所述CPU基于存储在所述存储器中的校正值数据,校正已由所述发光量检测装置检测出的发光量,以基于经校正的发光量和已由所述温度检测装置检测出的一个或多个温度来控制所述PWM控制电路。 The driving device for a backlight unit according to claim 1, comprising: a memory for storing a correction data obtained by actual measurement of the predetermined method in the memory, is disposed such that the light emitting amount detecting means in a case where a position away from the element group of the light emitting diode, the light emission amount detecting device of the light emitting diode element of the group to detect weak light as emitted, and the light emitting amount detecting means is disposed adjacent the a case where said position of the light emitting diode element group, the light emission amount detecting device of the light emitted by the light emitting diode element groups as light is detected, wherein the correction values ​​stored in the CPU based on the memory data value , the amount of light emitted by the light emission correction amount detecting means detected, based on one or more of the temperature detected by the light emission amount has been corrected and said temperature detecting means to control the PWM control circuit.
  6. 6. —种用于背光单元的驱动方法,在所述背光单元中,由三原色的发光二极管元件构成的多个发光二极管元件组被布置在不同部分,其中每个所述发光二极管元件组由具有相同颜色的发光二极管元件串联连接而成,所述驱动方法包括:电压供应步骤,该步骤将电压供应到每个所述发光二极管元件组; 发光量检测步骤,该步骤检测从已被所述电压供应步骤供应了电压的发光二极管元件组发射的光线的量;温度检测步骤,该步骤检测所述发光二极管元件组的一个或多个温度;信号生成步骤,该步骤基于已由所述发光量检测步骤检测出的发光量和已由所述温度检测步骤检测出的一个或多个温度,生成PWM信号,该PWM信号用于控制所述发光二极管元件组的发光量;以及控制步骤,该步骤基于已由所述信号生成步骤生成的所述PWM信号,控制所述多个发光二极管 6. - it is driving methods for a backlight unit, the backlight unit, a plurality of light emitting diode elements the group consisting of light emitting diode elements of three primary colors are arranged in different portions, wherein each of said light emitting diode element having the group consisting of the same color light emitting diode elements connected in series, the driving method comprising: a voltage supply step of supplying a voltage to each of the light emitting diode element group; luminescence amount detecting step of detecting the voltage was from supplying step of supplying an amount of the light emitting diode element group emit light voltage; a temperature detecting step of detecting a group of said light emitting diode elements or a plurality of temperature; signal generating step, the step has been detected based on the luminescence amount one or more temperature steps and the amount of luminescence detected by said temperature detecting step has been detected, generates a PWM signal, the PWM signal for controlling the amount of light emission of the light emitting diode element group; and a control step of, based on the step the PWM signal has been generated by said signal generating step, controlling the plurality of light emitting diodes 元件组的发光量。 The amount of the light emitting element group.
  7. 7. 如权利要求6所述的用于背光单元的驱动方法,其中,所述各个发光二极管元件组被布置在其中所述串联连接的多个LED元件具有相同的温度的区域中。 7. The driving method of a backlight unit according to claim 6, wherein each of said light emitting diode elements are arranged in groups wherein the plurality of LED elements connected in series with the temperature in the region of the same.
  8. 8. 如权利要求6所述的用于背光单元的驱动方法,其中,所述各个发光二极管元件组被装配为使得所述串联连接的多个发光二极管元件被布置在水平方向上。 8. The driving method of a backlight unit according to claim 6, wherein said respective group of light emitting diode elements are mounted such that the plurality of light emitting diode elements connected in series are arranged in the horizontal direction.
  9. 9. 如权利要求6所述的用于背光单元的驱动方法,其中,在所述发光量检测步骤处,已从包括任意一种原色的发光二极管元件的发光二极管元件组生成的光线的量被检测。 9. The driving method of a backlight unit according to claim 6, wherein, in the light emission amount detecting step, comprising an amount of any one of the primary colors from the light emitting diode element emitting diode light generating element group is detection.
  10. 10. 如权利要求6所述的用于背光单元的驱动方法,包括: 幅度调整步骤,该步骤根据已由所述温度检测步骤检测到的一个或多个温度,调整在所述发光二极管元件组中流动的电流值的幅度,这样在所述控制步骤处,基于已在所述幅度调整步骤处输送的电流值和已由所述信号生成步骤生成的PWM信号,控制所述发光二极管元件组的发光输出。 10. The driving method of a backlight unit according to claim 6, comprising: the amplitude adjusting step of the one or more detected temperature based on the temperature detection by the step of adjusting the light emitting diode element group the amplitude of the current flowing value, so that the PWM signal at said control step, based on the current value is generated in the delivery step and the amplitude adjustment by the step of generating said signal, controlling the light emitting diode element group light-emitting output.
  11. 11. 如权利要求6所述的用于背光单元的驱动方法,包括: 选择步骤,该步骤根据己由所述温度检测步骤检测到的一个或多个温度,选择构成所述背光单元的发光二极管元件组,这样在所述控制步骤处,基于已由所述信号生成步骤生成的PWM信号,控制已由所述选择步骤选择的发光二极管元件组的发光量。 11. The driving method of a backlight unit according to claim 6, comprising: a selecting step of the one or more detected temperature by the temperature detecting step according hexyl, said selected light emitting diode backlight unit element group, so that in said control step, said signal has been generated based on the PWM signal generating step, controlling the selection by the amount of the light emitting diode emitting element group selection step.
  12. 12. 如权利要求6所述的用于背光单元的驱动方法,包括: 第一校正步骤,该步骤基于其中存储了通过预定的实际测量方法获得的校正值数据的存储器表的校正值数据,校正从用于在所述发光量检测步骤处检测从所述发光二极管元件组发射的光线的量的传感器获得的发光量,使得在所述传感器被布置在远离所述发光二极管元件组的位置的情况下,所述传感器将所述发光二极管元件组所发射的光线作为弱光来检测, 而在所述传感器被布置在靠近所述发光二极管元件组的位置的情况下,所述传感器将所述发光二极管元件组所发射的光线作为强光来检测,其中,在所述信号生成步骤处,基于已被所述第一校正步骤校正的发光量和已由所述温度检测步骤检测出的一个或多个温度,所述PWM信号被生成。 12. The driving method of a backlight unit according to claim 6, comprising: a first correction step, the correction step based on the correction values ​​stored therein data obtained by actual measurement of a predetermined memory data table value, the correction for detecting the light emission amount emitted from the light emitting diode light sensor element group obtained in the luminescence amount detecting step, such that in the case where the sensor is disposed at a position remote from said light emitting diode element of the group under the light emitting diode element of the sensor group to detect weak light emitted as, in the case where the sensor is disposed in a position adjacent to said light emitting diode element group, the sensor emitting the light emitting diode element of the group is detected as light, wherein in said signal generating step, has been corrected based on the light emission amount and the first correction step has been detected by said temperature detecting step of one or more temperatures, the PWM signal is generated.
  13. 13. 如权利要求6所述的用于背光单元的驱动方法,包括:光量比调整步骤,该步骤参考存储器表适当地调整各个颜色的发光二极管元件的光量比;以及第二校正步骤,该步骤基于所述存储器表中存储的在获得白光时被所述光量比调整步骤用作参考的任意一种颜色的温度信息和通过预定的实际测量方法获得的校正值数据来校正已由所述发光量检测步骤检测出的发光其中,在所述信号生成步骤处,基于已被所述第二校正步骤校正的发光量和已由所述温度检测步骤检测出的一个或多个温度,所述PWM信号被生成。 The second step and correction step; light intensity ratio adjusting step of adjusting the reference memory table appropriately light-emitting diode element ratio of each color: 13. The driving method of a backlight unit according to claim 6, comprising correcting the emission amount has been based on temperature information of any one color table stored in the memory is obtained when white light is used as a reference light amount ratio adjusting step and the correction data obtained by actual measurement of a predetermined wherein one or more temperature detecting step of detecting a light emission in said signal generating step, has been corrected based on the light emission amount and a second correction step of said temperature detecting step has been detected, the PWM signal It is generated.
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